Evaluation of surfactants on waste activated sludge fermentation by pyrosequencing analysis

Evaluation of surfactant removal efficiency in selected domestic wastewater treatment plants in Poland

“…It is estimated that changes of flock structure occur at a weight concentration of 0.01% of surfactants. Higher concentrations result in cell lysis [14].…”

Applying rhamnolipid to enhance hydrolysis and acidogenesis of waste activated sludge: retarded methanogenic community evolution and methane production

“…Before the ltration of samples, some routine analyses of reactor bottles such as total suspended solids (TSS) and volatile suspended solids (VSS) were conducted according to the standard methods used by Zhou et al 9,24 The sludge pH was determined by a pH meter (FE 20, METTLER TOLEDO, Switzerland). Based on the studies conducted previously in our group, dissolved hydrogen concentrations of sludge samples were detected by a microsensor multimeter (model: pH-50-5343 Unisense Denmark) and the concentrations were detected as soon as the samples were taken out from the reactors.…”

“…1,9,30 It has been reported by some researchers that the application of bio-surfactant is an efficient way to accumulate short chain fatty acids (SCFAs) as industrial products. [31][32][33][34][35] Many research works have been implemented and proven positive with regard to solubilization of particulate organics and SCFAs accumulation, 1,9,24 which could be attributed to the great reduction in surface tension of WAS. 34 Kavitha et al, 20,28 Ushani et al 27 and Banu et al 26 have substantiated that the combination of surfactant with other pre-treatment methods performed favorably in anaerobic biodegradability.…”

“…9 It was also documented that RL surfactants could enhance high abundance of acid-producing bacteria while chemosynthetic surfactants caused an evident reduction in bacterial diversity. 24 Although bio-surfactant pre-treatment was conrmed to have positive inuence on bacterial abundance related to hydrolysis and acidogenesis of WAS fermentation, 1,9,36 methane production seems to be inhibited aer bio-surfactant pre-treatment. Limited studies were made to understand methane inhibition by an environmentally-friendly system of pre-treatment and studies also of the evolution of major archaea communities in pre-treated WAS are rare.…”

Enhanced quinoline removal by zero-valent iron-coupled novel anaerobic processes: performance and underlying function analysis

“…7A); these are common fermentation phyla that are present in many AD reactors. [41][42][43] In traditional AD processes, microbial composition is considered to be closely related to organic matter degradation and acid formation. The total proportions of dominant phyla were in the range of 87.7% to 96.0% across the four groups.…”